Poison Talons( Fiendish Codex I: Hordes of the Abyss, p. 87)
Your claws drip with poison.
any two other Abyssal heritor feats, Claws of the Beast,
Once per hour, you can secrete poison onto your claws as a swift action. This poison remains in place until you damage a target with your claws. At that point, the creature struck must succeed on a Fortitude save (DC 10 + 1/2 your character level + your Con modifier) or take ld4 points of Strength damage. One minute later, the victim must save again or take an additional ld4 points of Strength damage. You are immune to your own poison. The poison you secrete from your talons cannot be collected or preserved.
Although you are immune to your own toxin, its presence tends to complicate the process of providing medical aid to others. Therefore, you take a -2 penalty on Heal checks.